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Air Pollution

Air Pollution. Chapter 18 Ahrens Monday, 23 November. Air pollution definition.

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Air Pollution

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  1. Air Pollution Chapter 18 Ahrens Monday, 23 November Monday, November 23

  2. Air pollution definition • Air pollutants are airborne substances (either solids, liquids, or gases) that occur in concentrations high enough to threaten the health of people and animals, to harm vegetation and structures, or to toxify a given environment Monday, November 23

  3. Ways to categorize air pollutants • There is human-induced air pollution and natural sources of air pollution • There are fixed sources of air pollution and moving sources of air pollution (mobile sources) • There are point sources of air pollution and area sources of air pollution • There are primary and secondary pollutants Monday, November 23

  4. Primary and secondary pollutants • Primary air pollutants enter the atmosphere directly from their sources • Examples are carbon monoxide and sulfur dioxide • Secondary air pollutants form only when a chemical reaction occurs with primary air pollutants • Examples are photochemical oxidants and acid deposition • Secondary air pollutants are more difficult to control Monday, November 23

  5. Santiago, Chile Monday, November 23 Fig. 18-CO, p. 500

  6. October 23, 2003 wild fires Monday, November 23 Fig. 18-1, p. 503

  7. Monday, November 23 Table 18-1, p. 503

  8. Monday, November 23 Fig. 18-2, p. 504

  9. Monday, November 23 Fig. 18-2, p. 504

  10. Monday, November 23 Fig. 18-2, p. 504

  11. Monday, November 23 Fig. 18-3a, p. 504

  12. Monday, November 23 Fig. 18-3b, p. 504

  13. East China Sea: pollution, smoke, and dust Monday, November 23 Fig. 18-4, p. 505

  14. Thunderstorm and cumulus clouds above a layer of haze Monday, November 23 Fig. 18-5, p. 506

  15. Monday, November 23 Table 18-2, p. 513

  16. Monday, November 23 Fig. 3, p. 516

  17. Monday, November 23 Fig. 18-10, p. 512

  18. Stepped Art Monday, November 23 Fig. 18-10, p. 512

  19. Monday, November 23 Table 18-3, p. 513

  20. Monday, November 23 Fig. 18-11, p. 514

  21. Monday, November 23 Fig. 18-12, p. 514

  22. A secondary pollutant: smog/photochemical oxidants/ozone • Smog originally meant smoke and fog • Now smog refers to the chemical soup created by sunlight acting on hydrocarbons (VOCs) and oxides of nitrogen in the presence of oxygen and sunlight • Ozone is the main constituent of smog, but there are many others, including PAN • Smog attacks the respiratory system Monday, November 23

  23. Monday, November 23 Fig. 18-6, p. 507

  24. Secondary air pollutant: acid deposition • Acid deposition: can be dry or acid rain, snow, fog, dew • Oxides of sulfur, oxides of nitrogen combine with water vapor or liquid water drops in the air • Sulfuric acid, nitric acid form • Acid attacks structures and plants • In bodies of water, acid allows heavy metals to leach out and contaminate water supplies, toxify water for fish and other living things Monday, November 23

  25. Monday, November 23 Fig. 18-21, p. 524

  26. Monday, November 23 Fig. 18-22, p. 524

  27. Monday, November 23 Fig. 18-23, p. 525

  28. Monday, November 23 Fig. 18-13, p. 515

  29. Monday, November 23 Fig. 18-14, p. 517

  30. Monday, November 23 Fig. 18-14a, p. 517

  31. Monday, November 23 Fig. 18-14b, p. 517

  32. Monday, November 23 Fig. 18-15, p. 517

  33. Monday, November 23 Fig. 4, p. 518

  34. Monday, November 23 Fig. 4a, p. 518

  35. Monday, November 23 Fig. 4b, p. 518

  36. Monday, November 23 Fig. 4c, p. 518

  37. Monday, November 23 Fig. 4d, p. 518

  38. Monday, November 23 Fig. 4e, p. 518

  39. Monday, November 23 Fig. 18-16, p. 519

  40. Monday, November 23 Fig. 18-17, p. 519

  41. Monday, November 23 Fig. 18-18, p. 520

  42. Stepped Art Monday, November 23 Fig. 18-18, p. 520

  43. Monday, November 23 Fig. 18-19, p. 520

  44. Monday, November 23 Fig. 5, p. 521

  45. Monday, November 23 Table 18-4, p. 522

  46. Monday, November 23 Fig. 18-20, p. 523

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